[issue4093] add gc/memory management tests to pybench

[Marc-Andre Lemburg]

Marc-Andre Lemburg <mal at egenix.com> added the comment:

I'm not sure whether pybench is the right tool for this.

Note that pybench disables GC per default for exactly the reasons
causing #4074 :-)

pybench already has a --with-gc switch, so it's possible to benchmark
with or without GC and see the differences.

Regarding memory management: The exact amount of used memory is hard to
determine from within a process due to the way e.g. Linux or other
modern OSes manage memory. We'd have to use special low-level system
APIs to access the true amount of allocated memory on each platform.

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<http://bugs.python.org/issue4093>
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